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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Compatibilizer prevents the catalytic role of sepiolite in the thermal degradation of PP/Sep nanocomposites

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Author(s):
de Lima, Juliana A. [1] ; Fitaroni, Lays B. [1] ; Waldman, Walter R. [2] ; Cruz, Sandra A. [3]
Total Authors: 4
Affiliation:
[1] Univ Fed Abc, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Ave Estados 5001, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Fed Sao Carlos Campus Sorocaba, Dept Fis Quim & Matemat, Rodovia Joao Leme Dos Santos, Km 110, BR-18052780 Sorocaba, SP - Brazil
[3] Univ Fed Sao Carlos, Dept Quim, Rodovia Washington Luis, Km 235, SP 310, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 146, n. 6, p. 2481-2487, DEC 2021.
Web of Science Citations: 0
Abstract

One of the dubious aspects of polymer/clay nanocomposites is its thermal stability compared to the pristine matrix since we can find works indicating different directions with relatively similar materials. This work aims to evaluate the influence of the sepiolite content and the PP-g-MA compatibilizer presence in the polypropylene/sepiolite nanocomposites degradation. PP/Sep nanocomposites were prepared in a twin-screw extruder with 0.75-5 mass% of Sep and with or without 2.5 mass% of PP-g-Ma as a compatibilizer. Material characterizations were performed by X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis (TGA). Morphology showed that the nanocomposites presented some needles agglomeration inside the polymer matrix, indicating the use of compatibilizer PP-g-MA was not enough for dispersion in the nanocomposites produced in this work. TGA results showed different results according to the nature of the atmosphere. In the oxidative atmosphere, the stability of nanocomposites was not significantly influenced by the sepiolite concentration, for concentrations lower than 1 mass%, and slightly influenced by the presence of PP-g-MA as a compatibilizer, while concentrations as large as 5 mass% of sepiolite showed a strong influence on the clay concentration. In the inert atmosphere, we observed the influence of the sepiolite concentration, decreasing the stability of the nanocomposite in the whole range of studied concentration. Regarding the presence of 2.5 mass% of PP-g-MA, all the formulations exhibit almost the same profile of mass loss, evidencing that the compatibilizer prevented the catalytic effect of the sepiolite in the thermal degradation of the nanocomposite. (AU)

FAPESP's process: 16/24936-3 - Development of thin films deposited by plasma for polymeric materials photoprotection
Grantee:Walter Ruggeri Waldman
Support Opportunities: Regular Research Grants
FAPESP's process: 16/25703-2 - Recycled polypropylene for food contact: employment of a-C:H thin films by plasma deposition and degradation in the presence of contaminants
Grantee:Sandra Andrea Cruz
Support Opportunities: Regular Research Grants